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Du B, Ji W, An H, Shi Y, Huang Q, Cheng Y, Fu Q, Wang H, Yan Y, Sun J. Functional analysis of c-di-AMP phosphodiesterase, GdpP, in Streptococcus suis serotype 2. Microbiol Res 2014; 169:749-58. [PMID: 24680501 DOI: 10.1016/j.micres.2014.01.002] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2013] [Revised: 01/19/2014] [Accepted: 01/19/2014] [Indexed: 12/25/2022]
Abstract
Streptococcus suis serotype 2 (SS2) is an important zoonotic pathogen that causes serious diseases in pigs and humans. GdpP protein is a recently discovered specific phosphodiesterase that degrades cyclic diadenosine monophosphate (c-di-AMP). It is widely distributed among the firmicutes phylum and altered expression of GdpP is associated with several phenotypes in various bacterial strains. We investigated the role of GdpP in physiology and virulence in SS2. An in-frame mutant of gdpP was constructed using homologous recombination and bacterial growth, biofilm formation, hemolytic activity, cell adherence and invasion, expression of virulence factors, and virulence were evaluated. Disruption of gdpP increased intracellular c-di-AMP level and affected growth and increased biofilm formation of SS2. Simultaneously, the gdpP mutant strain exhibited a significant decrease in hemolytic activity and adherence to and invasion of HEp-2 cells compared with the parental strain. Quantitative reverse transcriptase polymerase chain reaction indicated significantly reduced expression of the known virulence genes cps2, sly, fpbs, mrp, ef and gdh in the gdpP mutant. In murine infection models, the gdpP mutant strain was attenuated, and impaired bacterial growth was observed in specific organs. All these findings revealed a significant contribution of gdpP and its substrate (c-di-AMP) to the biology and virulence of SS2.
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Affiliation(s)
- Bin Du
- Department of Animal Science, School of Agriculture and Biology, Shanghai Jiao Tong University, Shanghai Key Laboratory of Veterinary Biotechnology, Key Laboratory of Urban Agriculture (South) Ministry of Agriculture, Shanghai 200240, PR China
| | - Wenhui Ji
- Department of Animal Science, School of Agriculture and Biology, Shanghai Jiao Tong University, Shanghai Key Laboratory of Veterinary Biotechnology, Key Laboratory of Urban Agriculture (South) Ministry of Agriculture, Shanghai 200240, PR China
| | - Huiting An
- Department of Animal Science, School of Agriculture and Biology, Shanghai Jiao Tong University, Shanghai Key Laboratory of Veterinary Biotechnology, Key Laboratory of Urban Agriculture (South) Ministry of Agriculture, Shanghai 200240, PR China
| | - Yibo Shi
- Department of Animal Science, School of Agriculture and Biology, Shanghai Jiao Tong University, Shanghai Key Laboratory of Veterinary Biotechnology, Key Laboratory of Urban Agriculture (South) Ministry of Agriculture, Shanghai 200240, PR China
| | - Qingqing Huang
- Department of Animal Science, School of Agriculture and Biology, Shanghai Jiao Tong University, Shanghai Key Laboratory of Veterinary Biotechnology, Key Laboratory of Urban Agriculture (South) Ministry of Agriculture, Shanghai 200240, PR China
| | - Yuqiang Cheng
- Department of Animal Science, School of Agriculture and Biology, Shanghai Jiao Tong University, Shanghai Key Laboratory of Veterinary Biotechnology, Key Laboratory of Urban Agriculture (South) Ministry of Agriculture, Shanghai 200240, PR China
| | - Qiang Fu
- Department of Animal Science, School of Agriculture and Biology, Shanghai Jiao Tong University, Shanghai Key Laboratory of Veterinary Biotechnology, Key Laboratory of Urban Agriculture (South) Ministry of Agriculture, Shanghai 200240, PR China
| | - Hengan Wang
- Department of Animal Science, School of Agriculture and Biology, Shanghai Jiao Tong University, Shanghai Key Laboratory of Veterinary Biotechnology, Key Laboratory of Urban Agriculture (South) Ministry of Agriculture, Shanghai 200240, PR China
| | - Yaxian Yan
- Department of Animal Science, School of Agriculture and Biology, Shanghai Jiao Tong University, Shanghai Key Laboratory of Veterinary Biotechnology, Key Laboratory of Urban Agriculture (South) Ministry of Agriculture, Shanghai 200240, PR China.
| | - Jianhe Sun
- Department of Animal Science, School of Agriculture and Biology, Shanghai Jiao Tong University, Shanghai Key Laboratory of Veterinary Biotechnology, Key Laboratory of Urban Agriculture (South) Ministry of Agriculture, Shanghai 200240, PR China.
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